Pawl-and-ratchet mechanism



JACOB V. ROIVLETT, OF RICHMOND, INDIANA.

PAWL-AND- RATC H ET M EC HAN ISM SPECIFICATION forming part of LettersPatent No. 466,107, dated December 29, 1891.

Application filed November 4, 1891. Serial No. 410,842. (MocleL) To allwhom, it may concern:

Be it known that 1, Moon V. ROWLETT, a citizen of the United States,residing at Richmond, in the county of \Vayne and State of Indiana, haveinvented certain new and usef ul Improvements in Pawl-and-RatchetMechanism; and I do hereby declare the following to be afull, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My presentinvention has reference to that class of pawlandratchetmechanism designed for engaging a loose part Wit-h a fixed part on ashaft, the objects being to improve the general construction and toincrease its eificiency in operation.

To these ends my invention consists in the construction and relativearrangement of the several parts constituting my improved pawland-ratchet mechanism, all of which will fully appear in the followingdescription.

Reference being had to the accompanying drawings, which form a part ofthis specification, Figure 1 represents in elevation my improvedpawl-and-ratchet mechanism. Fig. 2 is a top view of the same. Fig. Sisalongitudinal Vertical section; and Figs. 4:, 5, and 6 are details.

The reference-letter A in the drawings denotes the shaft upon which themechanism is mounted. Fixedly secured to this shaft in any suitablemanner, but preferably by means of the key a, is the ratchet b, which isprovided with three teeth I) and with a disk or face plate o integraltherewith, which forms which freely encircles the shaft, and is providedwith depressionsc, which conform in width to and fit over the guide cl,the central raised portion 01' entering the opening of the yoke. Thepawl-teeth f are formed with the curved face f and the straight face fwhich latter, when. power is applied, engages the.

straight face of the ratchet-teeth and causes the rotation of the wheel.WVhen, however, the shaft revolves in the opposite direction, the teethof the pawl ride freely over the ratchet-teeth, owing to the opening inthe pawl, thereby permitting it to slide on the guide and movealternately in or out or in opposite directions. WVhen one of the teethof the pawl reaches a tooth of the ratchet and rides thereon, the otherpawl-tooth enters the space between the adjacent ratchet-teeth, andhence there is no engagement. The guide d is formed with aconcavedepression (Z at each side of the portion d for the purpose of thedischarging of any dirt or dust that may accumulate under the pawl andprevent its proper working.

It will be observed that by reason of the construction employed eachratchet-tooth is in one complete revolution alternately engaged by thetwo pawl-teeth, and consequently an engagement of the pawl is had at sixpoints of the circumference.

By my invention I am enabled to produce a pawl-an d-ratchet mechanism ofinexpensive manufacture, few and simple parts, and which is strong,durable, and not liable to get out of order.

I claim as my invention- 1. A pawl-and-ratchet mechanism comprising aratchet fixedly secured to a shaft, a wheel loosely mounted thereon, anda pawl embracing said shaft and mounted on a guide on the pinion andadapted to slide thereon and having teeth adapted to operate inconnection with the ratchet, substantially as described.

2. In pawl-and-rat-chet mechanism, the combination of a shaft having aratchet fixed thereto, a wheel loosely mounted on said shaft and havinga guide thereon, a sliding yoke stantially as described, and for thepurpose to set forth.

In testimony whereof I aflix mysignature in presence of two witnesses.

JACOB V. ROXVLET'I.

shaped pawl having the depressions for said guide, and teeth on saidpawl adapted to operate with the ratchet-teeth, as described.

3. In pawl-and-ratchet mechanism,the combination, with a ratchet fixedto a shaft, and with a sliding pawlfor engaging said ratchet, of a Wheelloosely mounted on the shaft and I having a guide thereon for the pawl,and concave depressions in said guide, all sub- Witnesses:

EDWIN S. ROWLETT, CHAS. (J. GEHRING.

